package com.Hwadee.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.Hwadee.eduservice.entity.EduSubject;
import com.Hwadee.eduservice.entity.excel.SubjectData;
import com.Hwadee.eduservice.service.EduSubjectService;
import com.Hwadee.servicebase.exceptionHandler.GuliException;


public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    //因为SubjectExcelListener不能交给spring管理，需要自己new，不能注入其他对象
    //不能实现数据库操作

    public EduSubjectService subjectService;
    public SubjectExcelListener() {}
    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    //读取excel内容，一行一行就行读写
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if (subjectData == null) {
            throw new GuliException(20001, "文件数据为空");
        }
        //一行一行的读取，每次读取有两个值，第一个为一级分类，第二二级分类
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        //判断一级分类是否重复
        if (existOneSubject == null) {//没有相同的一级分类，进行添加到数据库
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());
            subjectService.save(existOneSubject);
        }
        //获取一级分类的id
        String pid = existOneSubject.getId();

        //添加二级分类
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        //判断二级分类是否重复
        if (existTwoSubject == null) {
            existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());
            subjectService.save(existTwoSubject);
        }

    }
    //判断一级分类不能重复
    private EduSubject existOneSubject(EduSubjectService subjectService, String name) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", 0);
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }
    //判断二级分类不能重复
    private EduSubject existTwoSubject(EduSubjectService subjectService, String name, String pid) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
